Discrete element method analysis of small-strain stiffness under anisotropic stress states

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Title: Discrete element method analysis of small-strain stiffness under anisotropic stress states
Author(s): Nguyen, C
O'Sullivan, C
Otsubo, M
Item Type: Journal Article
Abstract: This contribution assesses the influence of stress anisotropy on stiffness using discrete element method (DEM) simulations of true-triaxial tests supplemented with analytical studies. The samples considered comprised of normally consolidated random monodisperse samples. The simulations were carried out at four different mean stress levels; at each stress level, various combinations of the three principal stresses were considered. Stiffness was measured using planar wave propagation simulations. Using regression analysis it is shown that density effects can be considered using void ratio correction factors derived for isotropically compressed samples. However, a void ratio correction factor that considers coordination number is seen to be more marginally appropriate than the conventional form used in geotechnical experimental work. Material exponents that quantify the influence of each stress component on the stiffness were then determined. Analytical expressions derived from effective medium theory are less effective than the correction functions following the form used in the current experimental practice.
Publication Date: 1-Sep-2018
Date of Acceptance: 23-Jun-2018
URI: http://hdl.handle.net/10044/1/61791
DOI: https://dx.doi.org/10.1680/jgele.17.00122
ISSN: 2045-2543
Publisher: Thomas Telford
Start Page: 1
End Page: 7
Journal / Book Title: Géotechnique Letters
Volume: 8
Issue: 3
Copyright Statement: © ICE Publishing, all rights reserved. Original article available at https://www.icevirtuallibrary.com/doi/abs/10.1680/jgele.17.00122. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees.
Publication Status: Published
Online Publication Date: 2018-07-20
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Geotechnics



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